Mold serving device



R. w. BROWN 1,811,256

June 23, 1931.

MOLD SERVING DEVICE 4 Sheets-Sheet 1 Filed Feb. 28. 1930 I ll l '1.

INVENTOR Illl ATTO1RNEY$ June 23, 1931. w, BROWN 1 1,811,256

MOLD SERVING DEVICE Filed Feb. 28, 19 30 4 Sheets-Sheet 2 INVENTOR ATTORNEYJ.

June 23, 1931. R. w. BROWN 1,311,256

MOLD SERVING DEVICE Filed Feb. 28, 1950 4 Sheets-Sheet 3 INVENTOR ATTORNEYS.

June 23, 1931.

R. W. BROWN MOLD SERVING DEVICE Filed Feb. 28, 1930 4 Sheets-Sheet 4 1T0 VIE/20w, y M

ATTORN EYS.

.7 30 ure 1.

Patented June 23,1931

warren STATES PATENT OFFICE I: J ROY-W. BROW'N, OF AKRON, OHIO, ASSIGNOR TO THE FIRESTONE TIRE & RUBBER COM- I PANY, OIE AKRON, OHIO, A CORPORATION OF OHIO Mom) SERVING DEVICE Application filed February 28, 1930. Serial No. 432,022.

This invention relates to means for opening or cracking molds particularly of the individual watchcase type adapted to cure pneumatic tires.

It is an object of the invention to provide mold cracking means which serve a plurality of aligned individual molds.

It is a further object of the invention to provide means adapted to crack the mold and 10 lift the upper half thereof to a position which permits the cured article to be removed and a fresh article substituted.

Again, a more particular object of the invention resides in providing semi-automatic 15 mold cracking and lifting means arranged to quickly and effectively serve and handle parallel rows of individual molds.

The above and other objects of the invention are attained by the apparatus illus 1 29 trated in the accompanying drawings and described below, it being understood that the invention is not limitedto the specific form thereof shown and described.

In the drawings: I

Figure 1 is a plan view partly broken away of the mold cracking means embodying the invention. v Figure 2 is a side elevation partly broken away of the apparatus illustrated in Figi Figure 3 is an end view partlyv broken away of-the' apparatus shown in Figure 1.

Figure 4 is a schematic wiring diagram of the various switches, motors, etc., included 5 in the invention.

Referring to thedrawings, a plurality of tire molds of the watchcase type are arranged in parallel rowsas shown in Figure 1 below. apair of tracks 11 formed by suit- 40 able means such as I beams. The tracks 11 carry amold cracking and lifting device which includes abridge 15 which may be strengthened by raised ribs 15?. The bridge .15 is given a three-point suspension by ex- 45 tending it at 15 and pivotally attaching an axle bar 17 to the extended portion by a pin bolt 18. Wheels 19 journaled at the ends of the axle bar 17 and on the end of the bridge 15 oppositethe axle bar slidably support the 50 bridge on the tracks 11. In order to control the position ofthe bridge 15 on the tracks 11, a rack 20 is fixed to each track and a reversible motor 21 on the bridge 15 is arranged through the agency of a worm drive 22 to drive pinions 23 which engage with the racks 20 to propel the bridge in either direction along the tracks. A standard spring magnetic brake 24 is preferably provided on the drive shaft of the motor 21. This brake is of the type which is engaged or operative as long as no current is flowing tothe motor 21, but which releases when the motor is started as current also flows to the solenoid of the brake to lift it out of engagement against the action of a spring which normally holds it in engagement.

A carriage 25 is rotatably carried by a stud bolt 26 below the bridge 15. Fixed to the upper surface of the carriage 25 is a circular rack 27 with which engages a pinion 28 driven through a spring-held slip clutch 29 by a reversible motor 30. Journaled as at 31 on the lower end of the carriage 25 is an arcuate crane arm 32 which carries a pair of curved racks 33 on its outer surface. Pinions 34 mounted on a shaft 35 and driven by a reversible motor 36 through the agency of worm gearing 37 cooperate with the racks 33 to control the position and movement of the crane arm 32. A magnetic brake 38 similar to the brake 24 is provided in the drive of the motor 36.

Pivotally carried on a shaft 40 at the end of the crane arm 32 is a chuck 41 which is adaptedto engage with the upper half of the mold 10 as indicated at 42. The jaws of the chuck 41 are controlled by a handwheel 43 as will be understood. Means, such as a bar 44 on the mold 10, are adapted to cooperatewith brackets 44" on the carriage 25 to guide the upper mold half as it is being raised.

In order to supply the motors with current spaced trolley wires 45 are held adjacent the tracks 11 and trolleys 46 are provided to engage therewith.

In its preferred form the invention contemplates semi-automatic features of control which may be widely varied to suit the individual needs of each installation. In the embodiment of the invention illustrated such I means include a main control box 50 fixed tothe bridge 15. A push button station 51 may also be placed in more immediate relatioii to the operator if desired. vVhereas the motors are ordinarily started byhand from one of the push buttons, a number of limit. switches operated'by cams are provided to automatically stop the motors. A cam 52 engages with alimit switch 53 to stop the crane arm 32 111 its uppermost position, engages with a limit switch downward movement of the crane. arm. cam 56 cooperating with a switch 5'! is adapted to stop the crane arm in. an intermediate position when desired.

v To render the apparatus fool proof a pair of normally open llltBIlOCk switches 60 and to limit the 61 may be provided adjacent the crane arm 32,.

the switch being closed only when the arm is in itsintermediate position and the switch 61 only when the arm is fully raised by a suitable cani 62'onthe crane arm. The interlock switches 60 and 61 are'connected in the circuit'of the motors'21 and 30 respectively so thatit is impossible' to operate either motor unless the crane arm is in the'raised or intermediate position. Mounted on the bridge 15'on a raised platform 6% is a third normally. open interlock switch 65 which is closed by" a fixed cam 66 duplicated station only when the bridge is above a mold so that it is impossible to operate the crane arm up and downwhenthe bridge 1S moving from one mold to another. 7

' The platform 64. alsoserves to mount s x limit switches which serve in the following manner Switch 68, finaltravel in one direction; switch 69, final travel in the other d rection; switch 70, stop at each mold one d rection fswitch 7 -1 stop ateach mold other direction; switch 7 2, really a double switch, slow just before-each mold going one direction;

switch 73; really a doubleswitch, slowiust before each mold going other direction. Cams (not shown) are provided at either end of the track 11* to'oper'ate the limit switches 68 and 69 at the complete end of the bridge.

travel. This normally never occurs and is merely a safety feature. A cam 5, wh ch is duplicated at each mold station, serves to slow down'the motor 21 while a cam 76, also duplicated at each station,serves to stop the bridge at each mold station. Cams similar to cams 7 5 and 7 6 are provided (not shown) for the switches 71 and 73 when the bridge isinoving in the other direction. 1

Adjustable positive stops 80 may be pro-. vided onthe bridge 15 which engage with lugsSl on the carriageito, limit its rotation. 7

When the lug 81 engages the stop 80' the spring clutch 29 in the motordrive is adapted to slip preventing' breakage. This however, increases the motor load which kicks out standard overload relays (not showneXcept inFigure 4) to stopthe motor 30.

A similar cam-54 at each mold In Figure 4c the numerals 91 and 92 indicate a plurality of contacts normally'held in the open position. Asolenoid 91 in the control circuit is provided to hold the contacts 91-,closed when it is energized. A solenoid 9.2 is also provided to hold the'contacts 92 closed. The-contacts 91 and 92 are actually a triple pole, double throw switch so that it is impossible to hold both'sets of contacts together at thesame time. When the contacts 92'are closed the motor 36 is moving A. the crane arm downwardly to close the mold.

In this circuit are placed standard thermal overload relays 95 which are adapted to kick out to stop the motor 136 if the limit switch 55 fails tooperate or if the mold isfully closed before th'e' limitswitch is reached or the like. The relays 95 break thecontrol circuit at 95*; Hand reset ultimate overload relays 96 opening the, circuit at. 96? may also be provided in this motor circuit asan added protection The closing solenoid 92*" also serves to close a switch 92 of the holding circuit which allowsthe operato'rto remove ton97. e

For safety purposes the control circuit is also provided with a resetting solenoid" 98 which closes a: switch -98 by pushing either resetting button 99located on opposite sides of the control boX 50. The control circuit for the motor 36 also includes a solenoid 100'.Wl1l0l'1 is adaptedto hold switches 100 and 100 open and switch 100 closed'when it is not: energized and to hold switches 100 and 100 closed and switch 100 open when itis e'nergized: A solenoid 105 is also provided to lioldswitch l05' closed when it is energized. The. circuit alsohas a fully open-push button 106, aninterniediate open push button 107,,a stopbutton 108 and the fully open limit switch. 53, the close limit switch 55', the intermediate open limit switch 57, the interlock 65 and the brake 38 all hereinbefore described. V I

The control for theinotor 21 includes a double pole, double throw switch indicated his hand at once'from the close push butat 110 which iscoiitrolle'd'bya pair of" sole- 111-closed when energized Themotor' 21 is provided with both high andilow speed shown at 11 3 and 1145 respectively, and a triple'pole double throw switch indicated at 115 is arrangedto connect the supply leads to the one or'the'other thereof. A solenoid 116". is arranged to close the switch: 1l5l-to the low speed position and .a solenoid 117 a to close the'swit'ch 115 tothehigh speed positioir. I

This motor: control circuitt also includesv a The solenoid 11 1* in plurality of single pole double throw switches 120 3120 120 and 120 operated by a pull switch 121 (see control box'50), so that the apparatus can be operated from either side of the double row of molds 10. A single pole single throw switch 120 is closed when the switches 120%120, 120 and 120 are on the upper contacts-and a single pole single throw switch '120 is closed when the switches are'down, r

Automatic means are arranged to start the motor 21'to move the bridge to the next mold when the intermediate button has been pushed and the crane arm has been raised to theintermediate position where the interlock 60 has been closed by the cam 62. The currentfiowing through the traverse solenoid 105 not only serves to hold in the switch 105 but also a switch 105", thus causing thetraverse motor 21 to move the bridge to the next station. The interlock 60must engage shortlybefore the intermediate limit switch 57 breaks the circuit to the traverse solenoid 105 as will be evident. 7 V

The remaining apparatus in the traverse motor circuitincludes a forward push button .125, a reverse push button 126, a stop push button 127 a resetting safety device similar 7 to thatin the circuit of motor 36, comprising solenoid 130, which'closes a switch 130 by pushing either button 131, an overload relay 132 breaking the circuit at 132*, the brake 24 and the slowing down switches 7 2 and 73, the individual stop switches 70 and 71 and the final stop switches 68 and 69. From the diagram it will be seen that when theslowing down switches are operated'the current is supplied to the low speed leads of the motor, whereas it had been supplied to the high speed-leads,

The control for the motor 30, which is adapted to rotate the carriage25 supported 7 on the bridge 15, includes a triple pole, double throw motor reversing switch 135, having two sets of engaging contacts 136 and 137 A solenoid 136 is adapted to close the contacts 136 as well as hold in a switch 136 A solenoid 137 is also provided to close the contacts 1 .7 and a switch 137. A single pole double'throw switch 120 operated by the pull switch 121, aforementioned, is arranged in the circuit as shown.

Athermal overload relay 140 opening the circuit as at 140 is provided to open the motor circuit as the spring clutch 29 starts to slip when the lug 81 engages with the stop 80.

- An ultimate overload relay 141 may also open the circuit at 141 if desired. The other apparatus in the circuit includes right push buttons 142, left push buttons 143, interlock 61, and stops144.-

It is believed the operation of the apparatus will be apparent from the foregoing description, however,

the operation is briefly as follows:

The cure having been completed in the mold 10, the pull switch 121 is first pulled to throw all the switches 120 in one direction (assume it closes the switches 120 upwardly in Figure 4) so that the apparatus is operated from one side then, the close button 97 is pushed which starts the motor 36 and moves the crane arm 32 down so that the chuck 41 engages in the hole in the mold 10. The limit switch is now operated by the cam 54 to stop the motor 36 and the crane arm 32. If the limit switch 55 fails to operate due to variations in the molds or other causes the relay 95 will operate due to the increased load at the time the crane arm will move no further. The relay 96 will also operate it the relay 95 fails to function.

The handwheel 43 on the chuck 41 is rotated to lock the chuck in the mold and the fully open push button is pressed which re verses and starts the motor 36, thus cracking the mold. The upper mold half is first moved upward and then swung through an arc after the means 44 and 44 engage. The cam 52 engages with the limit switch 53 to stop the upward travel of the crane arm. The molded article can now readily beremoved and replaced with a green or unvulcanized one. The close button is again pushed which closes the mold as before. The chuck wheel 43 is rotated to the open position and the intermediate open button 107 is pushed which raises the crane arm until the interlock is closed by the cam 62 which energizes the traverse motor 21 to move the apparatus to the next mold where it automatically stops when the switch is opened by the cam 76. 7

When the fully open push button is operated the closing of the interlock 60 by the cam 62 has no effect as no current flows through the traverse solenoid 105 as will be evident from a study of Figure 4. The motor 21 has been thrown to the low speed leads when the cam 7 5 engages the slow down limit switch forward 72 as explained heretofore. In the meantime immediately after the interlock switch 60 has been thrown the intermediate limit switch 57 is opened by the cam 56 to stop the upward movement of the crane arm 32.

This operation is repeated at each mold slation. The final limit switches 68 and 69 prevent the apparatus from accidently overrunning and crashing into the end of the tracks. When the end of the row of molds is reached and the last mold refilled and as before. However, in this position of the crane arm the interlock switch 61 is closed by the cam 62 which allows either the right 142 or the left push button 143 to be operated which energizes the motor 30 to rotate the carriage 25 around so that the chuck 41 of way (downwardly) so that theapp aratus can be operated along the second row of molds from the other side of the control box 50. The operation on this side is similar to that above described and when the endof the row of molds is reached the carriage 25 is operated to aga'in. swing the chuck. 4cl back over the first row of molds. In this manner a "double'rowof molds is quickly and effectivelyserved and handled in a semi-automatic way which lowers production andla bor costs whileinsuring a more uniformly.

cured article of manufacture.

While the invention isparticu'larly adapted to serve individual tire molds, it also contemplates operating molds of any type adapted to manufacture 'a plurality of articles formed from various materials.

The invention also contemplates forming the tracks 11 in closed paths and arranging the molds to cooperate therewith. Also the number of parallel rows ofmolds can be increased'as can the length of thecrane arm 7-32 so that one serving apparatus will serve more molds.

As many other changes could be-made in the construction, particularly in regard to the-details of the wiring diagram and to the automatic features including the limit switches and the operating cams, it is in- I tended that all matter contained in the above description'or shown in the accompanying drawings shall be interpreted as illustrative only and not in alimiting sense, accordingly modifications and applicatonsof the invention can be resorted to without departing from'thespiritof the invention or the scope of the appended claims.

What is claimed is:

1 Incombination, a plurality of aligned molds arranged in two parallel rows, a pair oftracks above sa1d rows of molds, a bridge,

7 means adapted to give said bridge a threepoint'rolling suspension on said tracksya carriage, axial means for pivotally supporting said carriage below said bridge,an arcuate crane arm pivotally carried at the axis of. its are on the lower end of said carriage,

a'rack on the arcuate surface of said arm, a pinion on said carriage adapted to engage withsaid rack, a motor to control said pinion and thus the position o'f'the crane arm, a vertically extending chuck pivotally mounted at the; end of saidcrane arm and adapted to engage in openingsin said molds, and int-en locking means on said chuck and in the mold openlngs. e 1

2. In combination, a plurality of aligned molds arranged inftwo parallel'rows, apair of tracks above said rows of molds, a bridge, means adapted to give-said bridge a threepointrolling suspension on said tracks, a rack on said tracks, a pinion on said'bridge engaging with said rack and a motor for operating said pinion to control the position of said bridge on said tracks, a carriage, axial means for pivotally supporting said carriage below said bridge, an arcuate crane arm pivotallycarried at the axis of its are on the lower end of saidj carriage, a rack on thearcu- 7 ate surface of said arm, a pinion on said carriage adapted to engage with sa1d rack, a

motor to control said "pinion and thusthe means adapted to give said bridge a threepoint rolling suspension on saidtracks, a rack on said tracks, a pinion on said bridge engaging with said rack and a motor for operating said pinion to control the position of said bridge onsaid tracks, a carriage, axial means for pivotally supporting said carriage below said bridge, a circular rack on the upper portion of said carriage, a pinion on said bridge engaging with said rack and a motor for operating said pinionto control the rotative position of said carriage with respect to said bridge, an arcuate'crane arm pivotally carried at the axis of its are on the lower end of said carriage, a rack on thearcuate surface of said arm,.a pinion on said-carriage adapted to engage with said rack, a motor to control said pinion and thus the tending chuck pivotally mounted at the end ofsaid crane arm and adapted to engage in openings in said molds, and interlocking means on said chuck and -in1the mold open- V I V v I p 4. In combination, a pluralityof molds, tracks above said molds, a bridge, means adapted toigive said bridge a rolling suspension on said tracks, a rack on said tracks, a pinion on said bridge engaging with-said rack and a motor for operating said pinion to control the position of said bridge on said tracks, a carriage, axial means for pivotally supporting said carriage below said bridge, a circular rack on the upper portion of said carriage, a pinion on said bridge engaging with said rackanda motor for operating said pinion to control the rotativeposi- ,tionof said carriage'with respect to said sion on said tracks, means to bridge, an arcuate crane arm pivotally carried at the axis of its arc on the lower end of said carriage, a rack on the arcuate surface of said arm, a pinion on said carriage adapted to engage with said rack, a motor to control said pinion and thus the position of the crane arm, a vertically extending chuck pivotally mounted at the end of said crane arm and adapted to engage in openings in said molds, and interlocking means on said chuck and in the mold openings.

5. In combination, a plurality ofcn olds, tracks above said molds, abridge, means adapted to give said bridge a rolling suspension on said tracks, means to control the position ofjsaid bridge on said tracks, a carriage, axial means for pivotally supporting said carriage below said bridge, means to control the rotative position of said carriage With respect to said bridge, an arcuate crane arm pivotally carried at the axis of its are on the lowerend of said carriage, a rack onthe arcuate surface of said arm, a pinion on said carriage adapted to engage With said rack,

a motor to control said pinion and thus the position of the crane arm, a vertically extending chuck pivotally mounted at the end of said crane arm and adapted to engage in openings in said molds, and interlocking means on said chuck and in the mold openmgs.

6. In combination, a plurality of molds, tracks above said molds, a bridge, means adapted to give said bridge arolling suspencontrol the position of said bridge on said tracks, a carriage, axial means for pivotally carriage below said bridge, means to control the 'rotative position of said carriage With respect to said bridge, a crane arm pivotally carried on said carriage, means to control the position of the crane arm,,a vertically extending chuck pivotally said crane arm and adapted to engage in openings in said molds, and interlocking means on said chuck and in the mold openm s. v

i. In combination a plurality of molds, tracks adjacent said molds, a bridge, means adapted to give said bridge a rolling support means to control the position on said tracks, of said bridge on said track, said means including a reversible motor for driving said bridge, means for automatically slowing the motor down just before each mold station, means-for automatically stopping said motor at each mold station and braking means for quickly stopping said motor when no current is supplied to said motor, a carriage,means for pivotally supporting said carriage on said bridge, means for controlling the relative rotative positions of said bridge and said carriage, said means including a reversible motor for rotating said carriage and meansfor automatically stopping said motor When the car supporting said mounted at the end of.

riage is in proper alignment With a mold, an arcuate crane arm pivotally carried at the axis of its arc on the lower end of said carriage, a vertically extending chuck pivotally mounted at the end of said crane arm and adapted to engage in openings in said molds, interlocking means on said chuck and in said mold openings, means to control the position of said crane arm including a reversible motor, means to automatically stop the crane arm in a fully open position, means to automatically stop the crane arm in a fully closed position, means to automatically stop the crane arm in an intermediate position, and means for automatically starting the travel motor to drive the bridge along the tracks to the next mold station when the crane arm stops in the intermediate position.

8. In combination a plurality of molds, tracks adjacent said molds, a bridge, means adapted to give said bridge a rolling support on said tracks, means to control the position of said bridge on said track, said means including a reversible motor for driving said bridge, means for automatically stopping said motor at each mold station, a carriage, means for pivotally supporting said carriage on said bridge, means for controlling the relative rotative positions of said bridge and said carriage, said means including a reversible motor for rotating said carriage and means for automatically stopping said motor when the carriage is in proper alignment with a mold, a crane arm pivotally carried on the carriage, a vertically extending chuck pivotally mounted at the end ofsaid crane arm and adapted to engage in openings in said molds, inter locking means on said chuck and in said mold openings, means to control the position of said crane arm including a reversible motor, means to automatically stop the crane arm in a fully open position, means to automatically stop the crane arm in a fully closed position, means to automatically stop the crane arm in an intermediate position, and means for automatically starting the travel motor to drive the bridge along the tracks to the next mold station When thecrane arm stops in the intermediate position.

9. In combination a plurality of molds, tracks adjacent said molds, a bridge, means adapted to give said bridge a rolling support on said tracks, means to control the position of said bridge on said track, said means including a reversible motor for driving said bridge, means for automatically stopping said motor at each mold station, a carriage, means forpivotally supporting said carriage on said a vertically extending-chuck'pivotallymountp ed at the end-of said crane armand adapted to engage in openings in said molds, inter V carriage saidmeansincluding a reversible motor for rotating said carriage :and' means a chuck pivotally mounted at the end or said crane arm'and adapted to engage in openings in 'said m'olds, interlocking means -on said chuck 'andinsaid mold openings, means to control the position of said crane arm including a reversible motor, means to au'tomaticab ly stop thecrane arm ina fully open position, means to automatically stop the crane arm in a 'fully' closed position, and means to auto- 'matic'ally stop the crane arm in an intermediate position. 7 V v -1 0."In combination a plurality of molds tracks adjacent said molds, a -bri dge,'means adaptedto give said bridge arollingsupport on said' tracks, meansto control the position or said bridge-on said track, said-means ineluding a'reversible motor fordriving. said bridge, meansior automatically stopping said motor at each mold station, acarriage, means for 'pi votally supporting saidcarriage on said bridge, means tor controlling the relative rotative positionsoi said bridge and said carria-ge, said meansinclud-ing a reversible mo tor for rotating said *ca-rriage'and means for automatically stopping said motor when the carriage is improper alignment Witlia mold,

a crane arm pivotally carriedon the carriage,

locking; means on said chuck and in said mold-openings, means to control the osi'tion ofsaid' crane arm including areversi le motor, means to automatically stop the crane arm in an intermediate position, and means for automatically starting the travelmotor to drive thebridge along the-tracks to the next mold station when the crane arm stops in the intermediate position; i

1-1. In combination a plurality o'f mo'lds, tracks acent said molds, a bridge, means adapted to give saidbrid gearol li-ng support von said tracks, means to control theposition V of sa1d brldge on sa1d traclgacarriage, means 'for plvotall-y supporting sa1d carriage on said bridge, meansator controlling the relative rotativepositions of said :bridge and said for automatically stopping said motor when the carriage is in proper alignment'with a mold, an arcuate crane'arm pivot'ally carried at theaxis-of iss-arc on the lower end of said carriage, a vertically extending-plmclrpivotally mounted at 'theend of said crane arm and adapted to engage in openings insaid molds, interlocking means on said chuck. "and 1n said mold openings, means to control the posltion of said crane arm including :a reversible motor, "means to automatically stop "the-crane arm in a fully open position, means to automatically stopthecrane arm in aiully" closed position, means to automatically stop the crane arm in-an intermediate position,

" and means for-automatically starting the travel motor to drive the bridge alongthe tracks to the next mold station when thecr'ane arm stops in the intermediate position.

12. In combination a plurality of molds,

tracks adjacent said molds, :a bridge, means adapted-to give said bridgea rolling support on said tracks, means to control the position of said bridge on said track, a carriage, means for pivotally supporting saidcarrlage on sa1d bridge, means for controllln'g the relative rotative positionsof said bridge and saidcarriage,-'an arcuate crane arm pivotally carried at the axis of itsarc onthe lower end ofsaid carriage, a vertically extending chuck pivotally mounted at the end of sa1d crane arm and adaptedto engage in openings in said molds, interlocking means on said Chuck and in said mold openings, means to control the tracks adjacent said molds, a bridge, meansadapted togive said bridge a rolling support on said tracks, means to controlthoposition of-said bridge onsaid track, a-carriage, meansfor pi-votallysupporting said carriageyon said bridge, means/for controlling the relative rotative positions o'fsai'd bridge and said carriage, a crane arm pivotally carried on the carriage, a vertically extend-in chuck pivotally mounted 'at' the end of saic crane arm and adapted to engage in openings in said molds, interlocking meanson said chuck and insaid mold openings, and means tocontrol the position of sa1d crane arm including a 'reverslble motor.

l hln combination a plurality of molds, tracks adjacent saidmolds,a bridge,means adapted to give said bridge a rolling support on said tracks, means to control the position of said bridgeon saidtracln a carriage, means for pivotally supportingsaidcarriageon said bridge means for controlling the relative rotative, positions of said bridge and said carriage, a crane arm pivotailly carried on the carriage, means on saidcrane arnradapted to engage with means in said molds-"When the crane arm is in the lowered position, and

meansto control the position of said-=crane arm'mcludmg a reversiblemotor.

-15.v In combination a plurality of-molds, tracks adjacent said molds, a bridge, means adapted to give said bridge a rolling suppor'ton said tracks, means'tocon'trol the position of saidbridge on-said trac'k, said means including a reversible motor for driving said bridge, means forautomatically slowing the motor down just before each mold station, means for automatically stoppmg said motor at each mold station and braking means for quickly stopping said motor when no current 1s supplied to said motor, a carriage, means for pivotally supporting said carriage on said bridge, means for controlling the relative rotative positions of said bridge and said carriage, said means including a reversible motor for rotating said carriage and means for automatically stopping said motor when the carriage is in proper alignment with a mold, a crane arm pivotally carried on the carriage, a vertically extending chuck pivotally mounted at the end of said crane arm and adapted to engage in openings in said 'molds, interlocking means on said chuck and in said mold openings, and means to control the position of said crane arm including a reversible motor.

16. In combination a plurality of molds, tracks aojacent said molds, a bridge, means adapted to give said bridge a rolling support on said tracks, means to control the position of said bridge on said track, said means including a reversible motor for driving said bridge, means for automatically slowing the 'motor down just before each mold station,

reversible motor.

means for automatically stopping said motor at each mold station and braking means for quickly stopping said motor when no current is supplied to said motor, a carriage, means for pivotally supporting said carriage on said bridge, means for controlling the relative rotative positions of said bridge and said carriage, a crane arm pivotally carried on the carriage, a vertically extending chuck pivotally mounted at the end of said crane arm and adapted to engage in openings in said molds, interlocking means on said chuck and in said mold openings, and means to control the position of said crane arm including a 17. In combination a plurality of molds, tracks adjacent said molds, a bridge, means adapted to give said bridge a rolling support on said tracks, means to control the position 7. of said bridge on said track, a carriage, means for pivotally supporting said carriage on said bridge, means for controlling the relative rotative positions of said bridge and said carriage, said means including a reversible motor for rotating said carriage and means for automatically stopping said motor when the carriage is in proper alignment with a mold, a crane arm pivotallycarried on the carriage, a vertically extending chuck pivotally mounted at the end of said crane arm and adapted to engage in openings in said molds, interlocking means on said chuck and in said mold openings, and means to control the position of said crane arm including a reversible motor.

18. In combination 7 a plurality of molds, tracks adjacent said molds, a bridge, means adapted to give said bridge a rolling support on said tracks, means to control the position of said bridge on saidtrack, a carriage, means for pivotally supporting said carriage on said bridge, means for'controlling the relative r-otative positions of said bridge and said carriage, a crane arm pivotally carried on the carriage, a vertically extending chuck pivotally mounted at the end of said crane arm andadapted to engage in openings in said molds, interlocking means on said chuck and in said mold openings, means to control the position of said crane arm including a reversible motor, interlocking means preventing the operation of the bridge travel motor unless the crane arm is in a predetermined position, and means preventing the operation of the crane arm motor unless the bridge is stationary at a mold serving sta tion.

19. In combination a plurality of molds, tracks adjacent said molds, a bridge, means adapted to give said bridge a rolling support on said tracks, means to control the position of said bridge on said track, said means including a reversible motor for driving said bridge, means comprising fixed cams cooperating with switc ies on the bridge for automatically slowing the motor down just before each mold station, means comprising fixed'cams cooperating with switches on the bridge for automatically stopping said motor at each mold station, a carriage, means for pivotally supporting said carriage on said bridge, means for controlling the relative rotative positions of said bridge and said carriage, said means including a reversible-motor for rotating said carriage and means for automatically stopping said motor when the carriage is in proper alignment with a mold, a crane armpivotally carried on the carriage, a chuck pivotally mounted at the end of said crane arm and adapted to engage in openings in said molds, interlocking means on said chuck and in said mold openings, means to control the position of said crane arm including a reversible motor, means on the crane arm and carriage comprising cooperating cams and switches to automatically stop the crane arm in a fully open position, means on the crane arm and carriage comprising cooperating cams and switches to automatically stop the crane arm in a fully closed position, means on the crane arm and carriage comprising cooperating cams and switches to automatically stop the crane arm in an intermediate position, and means on the crane arm and carriage comprising cooperating cams and switches for automatically starting the travel motor to drive the bridge along the tracks to the next mold station when the crane arm stops in the intermediate position.

20. In combination a plurality of molds, tracks adjacent said molds, a bridge, means c otally supporting said carriage on said adapted to give said bridge a rolling support on said'tracks, means to control the position of said bridge on said track, said means in-v cluding a reversible motor for driving said bridge, means comprising fixed cams cooperating with switches on the bridge for automatically slowing the motor down just before each mold station, means comprising fixed cams cooperating with switches on the bridge for automatically stopping said motor at each mold station, a carriage, means for pivbridge, means for controlling the relative rotative positions of said bridge and 'said carriage, said means including a reversible motor for rotating said carriage and means for automatically stopping said motor when the carriage'is in proper alignment with a mold, a crane arm pivotally carried on the carriage,

a chuck pivotally mounted at the end of said crane armland adapted to engage in openings in. said molds, interlocking means on said chuck and in said mold openings, means to control the p-ositionof said crane arm including a reversible motor, means on the crane arm and carriage comprising cooperating cams and switches to automaticallystop the crane arm in a fully open position, means on 'the crane arm and carriage comprising cooperating cams and switches to automatically stop the crane arm in a fully closed position, and means on the crane arm and carriage' comprising cooperating cams vand switches to automatically stop the crane arm in an intermediate vposition.

ROY w. BROWN. 

